My first impression would be to check all 4 brakes to see if they are worn metal to metal or a backing plate is rubbing.Most garages like Midas or the like will perform a free brake inspection with no strings attached.If it's a rattle type noise it could be an exhaust heat shield or the inside of the convertor is loose.If the noise is only when the car is moving it's probably not from under the hood.Worn wheel bearings are one other possibility.
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